<template>
  <div v-show="show" class="nuxt-loading-container">
    <div class="nuxt-progress" :style="{
      'width': percent+'%',
      'height': height,
      'background-color': canSuccess? color : failedColor,
      'opacity': show ? 1 : 0
    }">
    </div>
    <div v-loading="show"></div>
  </div>
</template>

<script>
  import Vue from 'vue'
  export default {
    name: 'nuxt-loading',
    data () {
      return {
        percent: 0,
        show: false,
        canSuccess: true,
        duration: 5000,
        height: '',
        color: '',
        failedColor: '',
        text: '数据加载中...'
      }
    },
    methods: {
      start (text = '数据加载中...') {
        this.text = text
        this.show = true
        this.canSuccess = true
        if (this._timer) {
          clearInterval(this._timer)
          this.percent = 0
        }
        this._cut = 10000 / Math.floor(this.duration)
        this._timer = setInterval(() => {
          this.increase(this._cut * Math.random())
          if (this.percent > 95) {
            this.finish()
          }
        }, 100)
        return this
      },
      set (num) {
        this.show = true
        this.canSuccess = true
        this.percent = Math.floor(num)
        return this
      },
      get () {
        return Math.floor(this.percent)
      },
      increase (num) {
        this.percent = this.percent + Math.floor(num)
        return this
      },
      decrease (num) {
        this.percent = this.percent - Math.floor(num)
        return this
      },
      finish () {
        this.percent = 100
        this.hide()
        return this
      },
      pause () {
        clearInterval(this._timer)
        return this
      },
      hide () {
        clearInterval(this._timer)
        this._timer = null
        setTimeout(() => {
          this.show = false
          Vue.nextTick(() => {
            setTimeout(() => {
              this.percent = 0
            }, 200)
          })
        }, 500)
        return this
      },
      fail () {
        this.canSuccess = false
        return this
      }
    }
  }
</script>

<style lang="scss">
  .nuxt-loading-container {
    position: fixed;
    top: 0;
    left: 0;
    z-index: 99999;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    width: 100%;
    height: 100%;
    background: rgba(255,255,255,.8);
    color: $color-theme;

    .icon-loading {
      font-size: 26px;
    }

    .nuxt-progress {
      position: fixed;
      top: 0px;
      left: 0px;
      right: 0px;
      height: 2px;
      width: 0%;
      transition: width 0.2s, opacity 0.4s;
      opacity: 1;
      background-color: $color-theme;
      z-index: 999999;
    }
  }
</style>
